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	Annual Toxics Summary Los Angeles-North Main Street FAQs Zinc nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		30	47	*	72	81	17.0	14	9.98
2022		4.99	65	73.8	100	171	35.2	27	9.98
2021		37	79	*	100	219	40.3	22	9.98
2020		30	*	*	*	103	23.1	7	9.98
2019		13	56	*	110	147	35.2	29	9.98
2018		27	88	*	140	188	42.1	24	9.98
2017		18	68	76.2	140	180	40.1	30	10
2016		20	56	64.0	140	194	42.1	31	10
2015		21	51	62.1	96	183	34.0	30	10
2014		13	46	55.6	79	170	32.5	29	8.4
2013		24	59	*	99	150	31.3	23	5.2
2012		42	66	*	120	190	38.9	15	9
2011		30	*	*	*	110	28.7	8	9
2010		34	*	*	*	71	11.7	10	9
2009		16	61	*	97	120	26.1	27	9
2008		*	*	*	*	*	*	0	*
2007		22	65	*	100	180	32.3	25	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		39	*	*	*	88	19.5	5	1
2002		45	90	106	160	200	40.2	29	1
2001		21	93	*	140	200	42.3	22	2
2000		16	86	85.9	130	210	39.9	31	2
1999		36	89	95.2	170	230	46.8	30	2
1998		1	67	*	140	170	42.8	26	2
1997		26	74	*	150	250	57.1	17	2
1996		25	120	118	210	300	68.0	29	2
1995		12	93	104	190	310	69.9	28	2
1994		16	140	152	280	400	91.8	28	2
1993		25	110	*	160	170	43.2	23	2
1992		3	120	*	210	280	68.8	21	2
1991		32	120	133	230	290	63.8	28	2
1990		21	100	*	220	430	93.8	17	2
1989		*	*	*	*	*	*	0	*

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.